Gas tunnel zero net distance multi-coal seam group drainage hole layout method

Abstract

The present application relates to the technical field of tunnel construction, in particular to a gas tunnel zero net distance multi-coal seam group drainage hole layout method, before the drainage hole, first, the first working face with the coal seam distance first target distance to the geological layer containing zero net distance multi-coal seam group is carried out advanced geological prediction, and the outburst danger information of zero net distance multi-coal seam group is obtained according to the advanced geological prediction result, then the drainage hole layout scheme of zero net distance multi-coal seam group is determined according to the outburst danger information, so that the present application can formulate the corresponding drainage hole layout scheme according to the geological data corresponding to the zero net distance multi-coal seam group in the specific implementation, and the drainage hole is made on the first working face according to the formulated drainage hole layout scheme, which can carry out drainage hole construction on the zero net distance multi-coal seam group, and solves the technical defects that the coal seam group near the net distance or zero net distance multi-coal seam group cannot directly use the related technology to arrange the drainage hole in the tunnel construction area to extract gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel construction, in particular to a gas tunnel zero-clearance multi-coal seam group drainage hole layout method. BACKGROUND

[0002] In the process of gas highway tunnel construction containing coal seams, coal uncovering operation needs to be performed on the coal seams in front of the gas tunnel face. In the "Technical Code for Design and Construction of Highway Gas Tunnels", the definition of coal uncovering operation is: the process of starting excavation operation face 10m away from the coal seam and penetrating through the coal seam roof (bottom) plate with a minimum normal distance of 5m is the coal uncovering operation. The coal uncovering operation must strictly implement the relevant regulations for coal uncovering operation.

[0003] In the process of coal uncovering operation, the commonly used technology for outburst prevention and control is to set up drainage holes in the construction area of the tunnel, and use the drainage holes to drain the gas in the surrounding rock and the tunnel face. The layout of the drainage holes is that the distance between the tunnel left and right sidewalls, the inverted arch and the outer coal seam of the vault is not less than 12m, the minimum normal line from the outer edge of the vault control range (the vault control range refers to the fan-shaped control area formed by deflecting 45° from the center axis of the tunnel center line to the left and right sides of the tunnel on the tunnel cross section) to the tunnel contour line is not less than 5m, and after any one drainage hole penetrates through a layer of coal seam, it needs to extend at least 0.5m into the surrounding rock behind the coal seam.

[0004] The technology in the foregoing example is mainly applied to single coal seam. For zero-clearance multi-coal seam group, the related technology cannot completely perform individual treatment on each layer according to the outburst prevention and control process, and can only treat the coal seam group as one layer of coal, so it cannot directly use the related technology to arrange drainage holes in the tunnel construction area to drain gas. SUMMARY

[0005] The main purpose of the present application is to provide a gas tunnel zero-clearance multi-coal seam group drainage hole layout method, which aims to solve the technical problem that the related technology cannot directly use the related technology to arrange drainage holes in the tunnel construction area to drain gas when the zero-clearance multi-coal seam group.

[0006] To achieve the above-mentioned purpose, in a first aspect, the present application provides a gas tunnel zero-clearance multi-coal seam group drainage hole layout method, wherein the gas tunnel is excavated and penetrates through the zero-clearance multi-coal seam group in the geological layer, and the zero-clearance multi-coal seam group includes a plurality of coal seams arranged in sequence along the excavation direction of the gas tunnel.

[0007] The drainage hole layout method includes the following steps:

[0008] excavate to a first working face in the excavation direction; wherein a distance between the first working face and the coal seam close to the first working face in the zero-clearance multi-coal seam group is a first target distance;

[0009] at the first working face, perform advanced geological prediction on the geological layer to obtain first geological data of the geological layer; wherein the first geological data comprises geological data of the zero-clearance multi-coal seam group;

[0010] according to the first geological data, excavate to a second working face, and based on the second working face, obtain outburst danger information of the zero-clearance multi-coal seam group; wherein a distance between the second working face and the coal seam close to the second working face in the zero-clearance multi-coal seam group is a second target distance, and the outburst danger information comprises gas pressure, ton-coal gas content, and coal seam firmness coefficient;

[0011] according to the outburst danger information, determine a drainage hole arrangement scheme of the zero-clearance multi-coal seam group;

[0012] according to the drainage hole arrangement scheme, implement the drainage hole in the zero-clearance multi-coal seam group.

[0013] Optionally, the step of, at the first working face, performing advanced geological prediction on the geological layer to obtain first geological data of the geological layer, comprises:

[0014] at the first working face, performing advanced drilling on the geological layer to realize advanced geological prediction and obtain first geological data of the geological layer.

[0015] Optionally, the step of, according to the first geological data, excavating to a second working face, and based on the second working face, obtaining outburst danger information of the zero-clearance multi-coal seam group, comprises:

[0016] according to the first geological data, excavating to the second working face;

[0017] based on the second working face, obtaining a current interval between all adjacent two of the coal seams;

[0018] according to the current interval, formulating a corresponding treatment scheme;

[0019] according to the treatment scheme, performing outburst prevention and control on each of the coal seams, and obtaining a corresponding outburst prevention and control effect of each of the coal seams;

[0020] according to the outburst prevention and control effect, obtaining outburst danger information of the zero-clearance multi-coal seam group.

[0021] Optionally, the treatment scheme comprises a first treatment scheme and a second treatment scheme;

[0022] The step of formulating a corresponding treatment scheme according to the current interval includes:

[0023] The current interval is divided, wherein the current interval less than 7m is divided into a first interval data group, and the current interval greater than or equal to 7m is divided into a second interval data group;

[0024] When the current interval is in the first interval data group, at least two coal seams corresponding to the current interval are taken as the zero net distance multi-coal seam group, and the first treatment scheme is executed;

[0025] When the current interval is in the second interval data group, at least two coal seams corresponding to the current interval are taken as adjacent coal seam groups, and the second treatment scheme is executed.

[0026] Optionally, when the current interval is in the first interval data group;

[0027] After the step of obtaining the outburst danger information of the zero net distance multi-coal seam group according to the outburst prevention and control effect, the method further includes:

[0028] It is judged whether the outburst danger information meets a preset index;

[0029] When the outburst danger information meets the preset index, the second working face is excavated to a third working face; the distance between the third working face and the coal seam close to the third working face in the zero net distance multi-coal seam group is a third target distance;

[0030] Current outburst danger information corresponding to the third working face is detected and obtained;

[0031] It is judged whether the current outburst danger information meets the preset index;

[0032] When the current outburst danger information does not meet the preset index, the outburst prevention and control is performed on each coal seam based on the third working face, and a corresponding outburst prevention and control effect is obtained to obtain current outburst danger information, and the step of judging whether the current outburst danger information meets the preset index is returned to be executed until the current outburst danger information meets the preset index;

[0033] After the current outburst danger information meets the preset index, the third working face is excavated to a fourth working face; wherein the distance between the fourth working face and the coal seam close to the fourth working face in the zero net distance multi-coal seam group is a fourth target distance;

[0034] The fourth working face is taken as the third working face, and the step of detecting and obtaining the current outburst danger information corresponding to the third working face is performed until the current outburst danger information meets the preset index;

[0035] After the current outburst danger information meets the preset index, each coal seam group is taken as the zero-clearance multi-coal seam group, and excavation is performed from the fourth working face to pass through the zero-clearance multi-coal seam group.

[0036] Optionally, before the step of determining the drainage hole arrangement scheme of the zero-clearance multi-coal seam group according to the outburst danger information, the method further comprises:

[0037] According to the first geological data, the simulation calculation data information under different working conditions is obtained.

[0038] The step of determining the drainage hole arrangement scheme of the zero-clearance multi-coal seam group according to the outburst danger information comprises:

[0039] According to the outburst danger information and the simulation calculation data information, a first initial design scheme of the drainage hole of the zero-clearance multi-coal seam group is obtained; wherein the first initial design scheme comprises a first initial layout area of the drainage hole.

[0040] The first initial layout area is checked and a to-be-supplemented drilling area is screened out from the first initial layout area; wherein the to-be-supplemented drilling area is an area not covered by the drainage hole in the first initial layout area.

[0041] A number of drilling holes are arranged in the to-be-supplemented drilling area to form the drainage hole arrangement scheme.

[0042] Optionally, the step of obtaining the simulation calculation data information under different working conditions according to the first geological data comprises:

[0043] According to the first geological data, longitudinal section information of the zero-clearance multi-coal seam group is obtained; wherein the longitudinal section information comprises contour information and treatment contour information of the gas tunnel.

[0044] According to the longitudinal section information, horizontal section information corresponding to each coal seam in the zero-clearance multi-coal seam group is obtained; wherein the horizontal section information comprises the contour information and the treatment contour information.

[0045] establishing a first model; wherein the first model is a data model for dynamically simulating the zero-net-distance multi-coal-seam group, and the data model records coal matrix elastic modulus data, Poisson's ratio data, coal matrix density data, coal seam initial porosity data, coal seam initial fracture permeability data, gas dynamic viscosity data, initial gas pressure data, Langmuir pressure parameter data, and Langmuir volume strain constant data;

[0046] According to the first model, the longitudinal section information, and the transverse section information, the simulation calculation data information under different working conditions is obtained.

[0047] Optionally, the step of checking and screening out the to-be-supplemented drilling area from the first initial layout area comprises:

[0048] According to the transverse section information and the longitudinal section information, a second model of the zero-net-distance multi-coal-seam group including the first initial layout area is established; wherein the second model is a three-dimensional model of each coal seam, and the three-dimensional model includes strike information of each coal seam and included angle information of the gas tunnel and each coal seam.

[0049] The second model is checked, and the to-be-drilled area is screened out from the second model.

[0050] Optionally, a gas overflow channel is formed in the zero-net-distance multi-coal-seam group.

[0051] After the step of drilling the drainage hole according to the drainage hole arrangement scheme, the first working face is arranged to drill the drainage hole in the zero-net-distance multi-coal-seam group.

[0052] At the first working face, hydraulic punching and hydraulic slotting are performed on the zero-net-distance multi-coal-seam group to increase the gas overflow channel.

[0053] Optionally, the step of drilling the drainage hole in the zero-net-distance multi-coal-seam group according to the drainage hole arrangement scheme comprises:

[0054] According to the drainage hole arrangement scheme, the first working face is drilled towards the zero-net-distance multi-coal-seam group to drill the drainage hole.

[0055] The technical scheme of the present application is that, after a gas tunnel is excavated and passes through a zero-clearance multi-coal-seam group including multiple coal seams arranged in sequence along the excavation direction of the gas tunnel, a first working face with a distance to the coal seam closest to the zero-clearance multi-coal-seam group being a first target distance is excavated along the excavation direction of the tunnel, at the first working face, the geological stratum is subjected to advanced geological prediction and first geological data of the geological stratum are obtained, then the outburst danger information of the zero-clearance multi-coal-seam group is obtained according to the first geological data, and the drainage hole arrangement scheme of the zero-clearance multi-coal-seam group is determined according to the outburst danger information, and finally the drainage holes are constructed in the zero-clearance multi-coal-seam group according to the drainage hole arrangement scheme. The technical scheme of the present application first performs advanced geological prediction on the geological stratum including the zero-clearance multi-coal-seam group at the first working face with a distance to the coal seam being the first target distance before the drainage holes are constructed, and the outburst danger information of the zero-clearance multi-coal-seam group is obtained according to the advanced geological prediction result, and preferably the drainage hole arrangement scheme of the zero-clearance multi-coal-seam group is determined according to the outburst danger information, so that the present application can formulate the corresponding drainage hole arrangement scheme according to the geological data corresponding to the zero-clearance multi-coal-seam group in specific implementation, and the drainage holes are constructed on the first working face according to the formulated drainage hole arrangement scheme, so that the person skilled in the art can perform the drainage hole construction when facing the zero-clearance multi-coal-seam group, and the technical defect that the related art cannot directly use the related technology to arrange the drainage holes in the tunnel construction area to extract gas when the coal seam group is close to the net distance or the zero-clearance multi-coal-seam group is solved. BRIEF DESCRIPTION OF DRAWINGS

[0056] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by the person skilled in the art without creative labor based on the drawings shown.

[0057] Figure 1 The flowchart of the drainage hole arrangement method of the zero-clearance multi-coal-seam group of the gas tunnel according to the present application;

[0058] Figure 2 For Figure 1 The detailed flowchart of step S300 according to the present application;

[0059] Figure 3 For Figure 2 The detailed flowchart of step S310 according to the present application;

[0060] Figure 4 For Figure 1 The flowchart of some specific embodiments of the example method;

[0061] Figure 5For Figure 1 Flow chart of yet some embodiments of the example method;

[0062] Figure 6 For Figure 5 Refined flow chart of step B100 of the example;

[0063] Figure 7 For Figure 6 Refined flow chart of step B140 of the example;

[0064] Figure 8 For Figure 1 Flow chart of some improved embodiments of the example method;

[0065] Figure 9 For Figure 8 Flow chart of step C100 of the example;

[0066] Figure 10 For Figure 9 Flow chart of step C160 of the example;

[0067] Figure 11 For Figure 1 Flow chart of some other specific embodiments of the example method;

[0068] Figure 12 Structural schematic diagram for the control range of the drainage hole in the example method of the present application;

[0069] Figure 13 Structural schematic diagram for the longitudinal section relationship of the gas tunnel and the geological structure of the zero-clearance multi-coal seam group in the example of the present application;

[0070] Figure 14 Structural schematic diagram for the gas control contour line area of the example method of the present application;

[0071] Figure 15 Plan structural schematic diagram for the gas control contour line area of the example method of the present application;

[0072] Figure 16 For Figure 15 Plan structural schematic diagram for the drainage hole arrangement of the C7 coal seam in the example;

[0073] Figure 17 For Figure 16 Plan structural schematic diagram for the drainage hole arrangement of the C8 coal seam in the example;

[0074] Figure 18 For Figure 15 Structural schematic diagram for the drainage hole arrangement of the upper drift heading face of the tunnel in the example;

[0075] Figure 19 For Figure 15A schematic view of the arrangement of the drainage hole of the lower tunnel face of the example tunnel;

[0076] Figure 20 A schematic view of the arrangement of the drainage hole of the example method of the present application;

[0077] Figure 21 A schematic view of the first model of the example of the present application.

[0078] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0079] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0080] It should be noted that all directional indications, such as up, down, left, right, front, back, etc., in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between mechanisms in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0081] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0082] In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0083] The inventive concept of the present application is further illustrated below in conjunction with some specific embodiments.

[0084] The present application proposes a gas tunnel zero-clearance multi-coal seam group drainage hole layout method.

[0085] As shown in Figures 1 to 21 An embodiment of the gas tunnel zero-clearance multi-coal seam group drainage hole layout method of the present application is proposed.

[0086] In this embodiment, please refer to Figure 1 The gas tunnel zero-clearance multi-coal seam group drainage hole layout method, the gas tunnel is excavated and passes through the zero-clearance multi-coal seam group in the geological layer, the zero-clearance multi-coal seam group includes a plurality of coal seams arranged in turn along the excavation direction of the gas tunnel;

[0087] The drainage hole layout method includes the following steps:

[0088] S100, excavate along the excavation direction to the first working face; wherein the distance between the first working face and the coal seam close to the coal seam in the zero-clearance multi-coal seam group is the first target distance;

[0089] In this embodiment, when the tunnel is excavated along the excavation direction to the first working face, the drilling and blasting method, the bench method and other construction methods in the prior art can be used for excavation construction, and the gas content in the air in the area where the tunnel excavation face is located also needs to be detected and warned during the excavation construction. In the example, the technology for detecting and warning the gas content in the air is prior art, and the present application only applies it and does not involve the improvement or design of the example gas content detection and warning technology, so it is not described one by one here.

[0090] It needs to be particularly and explicitly pointed out that in the exemplary technology, the method of the present application is applied to a coal group with a minimum clear distance between any two adjacent coal seams less than 7m. Meanwhile, the first working face formed by excavation can be perpendicular to the longitudinal section of the tunnel, or can form an intersection with the longitudinal section of the tunnel, and the specific intersection mode can be as follows: taking the longitudinal section of the tunnel as the observation surface, the first working face starts from the inverted arch of the tunnel, and gradually extends to the direction of the tunnel vault in the tunnel excavation direction at an angle greater than 0 degrees and less than or equal to 90 degrees; or taking the plane of the tunnel as the observation surface, the first working face starts from the inverted arch of the tunnel, and gradually extends to the geological body in the tunnel excavation direction at an angle greater than 0 degrees and less than or equal to 90 degrees. In specific implementation, the two working face forming modes can exist alone or simultaneously, and the specific arrangement mode of the first working face can be flexibly selected. Meanwhile, in the exemplary technology, the first target distance is at least 20m, and in specific implementation, the preferred first target distance is 20m. In an example, the first target distance is the normal distance between the first working face and the coal seam surface on the side of the zero-clearance multi-coal seam group close to the first working face, i.e., the vertical distance between the first working face and the zero-clearance multi-coal seam group. By setting the first target distance as the vertical distance between the first working face and the zero-clearance multi-coal seam group, the present application can achieve the protection effect of the zero-clearance multi-coal seam group through the geological layer arranged between the zero-clearance multi-coal seam group and the first working face in specific implementation, thereby improving the safety during gas tunnel construction.

[0091] S200, at the first working face, performing advanced geological prediction on the geological layer to obtain first geological data of the geological layer; wherein the first geological data includes geological data of the zero-clearance multi-coal seam group;

[0092] In this embodiment, when performing advanced geological prediction on the geological layer, advanced prediction can be performed on the geological body and the zero-clearance multi-coal seam group formed in the geological body by means of advanced drilling, geological radar, and other advanced geophysical prospecting methods, thereby obtaining geological data information of the geological body and the zero-clearance multi-coal seam group in the geological body. In the exemplary embodiment, the preferred prediction mode of advanced geological prediction is advanced drilling geological prediction.

[0093] In the exemplary technology, the main process of the advanced drilling for the advanced geological prediction is that, according to the first working face, at least three drillings are drilled, at least one of which needs to be cored, the hole diameter is at least 0.76 meters, and the depth of any one drilling needs to pass through the zero-clearance multi-coal seam group in the geological body and extend at least 5 meters into the geological body behind the zero-clearance multi-coal seam group, that is, the geological data information of the zero-clearance multi-coal seam group and the geological body within 5 meters behind the zero-clearance multi-coal seam group is obtained through the drilling. Through this setting mode, the geological data information of the entire zero-clearance multi-coal seam group can be obtained through one advanced geological prediction in the specific implementation of the present application, the construction efficiency is improved, the accuracy of the obtained geological data is guaranteed, and the construction difficulty is reduced and the construction period is shortened.

[0094] It needs to be particularly and explicitly pointed out that in the present embodiment, the example of the first geological data at least includes the geological data of the zero-clearance multi-coal seam group and the geological data of the rock stratum and the like non-coal seam. Moreover, whether it is the geological data of the zero-clearance multi-coal seam group or the geological data of the rock stratum and the like non-coal seam, the address data should include the thickness information of the geological body, the dip angle, the rock stratum strike information of the geological body, the spacing information between the adjacent coal seams or the coal seam and the adjacent geological body and the like.

[0095] S300, according to the first geological data, excavate to the second working face, and obtain the outburst danger information of the zero-clearance multi-coal seam group based on the second working face; wherein the distance between the second working face and the coal seam close to the setting coal seam in the zero-clearance multi-coal seam group is a second target distance, and the outburst danger information includes the gas pressure, the ton coal gas content and the coal seam firmness coefficient;

[0096] In the present embodiment, the way and process of obtaining the outburst danger information of the zero-clearance multi-coal seam group according to the first geological data are performed according to the content recorded in the “Highway Gas Tunnel Design and Construction Technical Specification”-JTG / T3374-2020. Therefore, the specific obtaining way of the outburst danger information and its definition will not be described here.

[0097] It needs to be particularly and explicitly pointed out that in the present embodiment, the example of the second target distance is also the minimum normal distance between the second working face and the zero-clearance multi-coal seam group. In the exemplary technology, the second target distance is 10m.

[0098] S400, according to the outburst danger information, determine the drainage hole arrangement scheme of the zero-clearance multi-coal seam group; in the present embodiment, when the drainage hole arrangement scheme of the zero-clearance multi-coal seam group is determined according to the outburst danger information, the specific operation process can be performed according to the content recorded in the “Highway Gas Tunnel Design and Construction Technical Specification”-JTG / T3374-2020.

[0099] S500, according to the drainage hole arrangement scheme, the drainage hole is made in the zero-clearance multi-coal seam group.

[0100] In this embodiment, when the drainage hole is made in the zero-clearance multi-coal seam group, the requirements of the specifications such as the Technical Code for Design and Construction of Highway Gas Tunnel, the Detailed Rules for Prevention and Control of Coal and Gas Outburst (2019 Edition) and the like are implemented.

[0101] The technical scheme of the present application is to let the gas tunnel be excavated and pass through the zero-clearance multi-coal seam group in the geological layer, which includes a plurality of coal seams arranged in sequence along the excavation direction of the gas tunnel, then excavate along the tunnel excavation direction to the first target distance between the first working face and the coal seam close to the zero-clearance multi-coal seam group, at the first working face, perform advanced geological prediction on the geological layer and obtain the first geological data of the geological layer, then excavate to the normal line 10m, obtain the outburst danger information of the zero-clearance multi-coal seam group, and determine the drainage hole arrangement scheme of the zero-clearance multi-coal seam group according to the outburst danger information, and finally make the drainage hole in the zero-clearance multi-coal seam group according to the drainage hole arrangement scheme. The technical scheme of the present application first performs advanced geological prediction on the geological layer including the zero-clearance multi-coal seam group at the first working face with a distance of the first target distance from the coal seam, and obtains the outburst danger information of the zero-clearance multi-coal seam group at the normal line 10m according to the advanced geological prediction result, and finally determines the drainage hole arrangement scheme of the zero-clearance multi-coal seam group according to the outburst danger information, so that the present application can formulate the corresponding drainage hole arrangement scheme according to the geological data corresponding to the zero-clearance multi-coal seam group in the specific implementation, and make the drainage hole on the working face at the normal line 10m according to the formulated drainage hole arrangement scheme, so that the person skilled in the art can perform drainage hole construction when facing the zero-clearance multi-coal seam group, and solve the technical defects that the related technology cannot directly use the related technology to arrange the drainage hole in the tunnel construction area to extract gas when the coal seam group of the zero-clearance multi-coal seam group.

[0102] In some specific embodiments, at the first working face, the step of performing advanced geological prediction on the geological layer to obtain the first geological data of the geological layer includes:

[0103] At the first working face, the geological layer is advanced drilled to realize advanced geological prediction and obtain the first geological data of the geological layer.

[0104] In this embodiment, when performing advanced geological prediction on the geological layer, the content recorded in the Technical Specification for Highway Tunnel Construction, the Technical Specification for Advanced Geological Prediction of Railway Tunnel, QCR9217-2015, and the Technical Code for Design and Construction of Highway Gas Tunnel, JTG / T 3374-2020 can be implemented.

[0105] In some embodiments, please refer to Figure 2 According to the first geological data, excavate to the second working face, and based on the second working face, obtain the outburst danger information of the zero-clearance multi-coal group, including:

[0106] S310, according to the first geological data, excavate to the second working face;

[0107] In this embodiment, in specific implementation, before excavation, first excavate from 20m away from the coal group to 10m away from the coal group according to the first geological data to form the second working face, wherein the example of 20m and 10m are both the minimum clearances between the corresponding working face and the coal group.

[0108] S320, based on the second working face, obtain the current distance between all adjacent two coal seams;

[0109] In this embodiment, in specific implementation, when excavating to the minimum clearance of 10m from the coal group, the current distance between all adjacent two coal seams is obtained according to the previously obtained geological data. It needs to be particularly and explicitly pointed out that the current distance in the example of this embodiment is the minimum clearance between the adjacent two coal seams.

[0110] S330, according to the current distance, formulate the corresponding treatment scheme;

[0111] In this embodiment, when formulating the corresponding treatment scheme according to the distance, the corresponding treatment scheme can be determined according to the distance condition. In specific implementation, the type of the distance can be determined first, specifically, the distance between the adjacent two coal seams less than 10m is defined as the first distance, and the distance greater than or equal to 7m and less than 10m is defined as the second distance. Then when formulating the corresponding treatment scheme according to the distance, the distance less than 7m and the distance greater than or equal to 7m and less than 10m can be filtered out from the distance information output from step S310, and then the corresponding coal seam within the corresponding distance is taken as a whole to formulate the treatment scheme. For example, when the distance is less than 7m, the first treatment scheme can be selected; when the distance is greater than or equal to 7m and less than 10m, the second treatment scheme can be selected.

[0112] It needs to be particularly and explicitly pointed out that in the embodiment, the first treatment scheme is a treatment scheme for zero net distance coal seam group, that is, the core treatment idea of the first treatment scheme is to treat the coal seam group less than 7m as a whole zero net distance multi-coal seam group. The core treatment idea of the second treatment scheme is that as long as the interval between any two adjacent coal seams is greater than 7m, at least two coal seams corresponding to the interval can be treated as adjacent coal seams, and the specific treatment process is to treat each coal seam as a single layer-by-layer coal uncovering. Of course, in the specific implementation process, if there is a situation that the interval between the adjacent and interval formed four coal seams is greater than 7m, and the interval is located between the second coal seam and the third coal seam, the coal seam with the interval greater than 7m is taken as an interval, and the first coal seam and the second coal seam, the third coal seam and the fourth coal seam are treated as two zero net distance coal seam groups, and then the two zero net distance coal seam groups are treated as two adjacent coal seams. That is, the first coal seam and the second coal seam, the third coal seam and the fourth coal seam are treated according to the first treatment scheme, and the second coal seam to the third coal seam is treated according to the second treatment scheme.

[0113] S330, according to the current interval, a corresponding treatment scheme is formulated;

[0114] In the embodiment, in the specific implementation, the specific process of preventing outburst of each coal seam according to the treatment scheme can be performed according to the content recorded in the “Highway Gas Tunnel Design and Construction Technical Specification” (JTGT 3374-2020).

[0115] S340, according to the treatment scheme, the outburst prevention treatment of each coal seam is performed, and the corresponding outburst prevention treatment effect of each coal seam is obtained;

[0116] In the embodiment, when the outburst prevention treatment of each coal seam is performed, it is performed at a position with a minimum net distance of 10m from the coal seam.

[0117] S350, according to the outburst prevention treatment effect, the outburst danger information of the zero net distance multi-coal seam group is obtained.

[0118] In the embodiment, the process of obtaining the outburst danger information of the zero net distance multi-coal seam group according to the outburst prevention treatment effect can be performed according to the content recorded in the “Highway Gas Tunnel Design and Construction Technical Specification” - JTG / T 3374-2020.

[0119] In the embodiment, the outburst danger information of the zero net distance multi-coal seam group is obtained according to the first geological data, the interval between all adjacent two coal seams is obtained, then whether the interval is less than 7m is determined to determine the corresponding treatment scheme, then the outburst prevention treatment is carried out according to the corresponding treatment scheme, the outburst prevention treatment effect of each coal seam is obtained, and finally the outburst danger information of the zero net distance multi-coal seam group is obtained according to the outburst prevention treatment effect, so that the outburst danger information of the zero net distance multi-coal seam group can be accurately obtained in the specific implementation of the embodiment.

[0120] In some specific embodiments, referring to Figure 3 , the treatment scheme includes a first treatment scheme and a second treatment scheme;

[0121] According to the current interval, the step of formulating the corresponding treatment scheme includes:

[0122] The current interval is divided, wherein the current interval less than 7m is divided into a first interval data group, and the current interval greater than or equal to 7m is divided into a second interval data group;

[0123] S311, when the current interval is in the first interval data group, at least two coal seams corresponding to the current interval are taken as a zero net distance multi-coal seam group, and the first treatment scheme is executed;

[0124] In the embodiment, when the first treatment scheme is used to process the adjacent coal seams in the first interval data group in the specific implementation, the setting complexity of the construction treatment scheme can be simplified, the setting efficiency of the treatment scheme can be improved, and the treatment efficiency of the outburst prevention treatment of the coal seam can be improved in the construction process of the embodiment.

[0125] S312, when the current interval is in the second interval data group, at least two coal seams corresponding to the current interval are taken as a adjacent coal seam group, and the second treatment scheme is executed.

[0126] In the embodiment, when the second treatment scheme is used to process the adjacent coal seams in the second interval data group in the specific implementation, the setting complexity of the construction treatment scheme can be simplified, the setting efficiency of the treatment scheme can be improved, and the treatment efficiency of the outburst prevention treatment of the coal seam can be improved in the construction process of the embodiment.

[0127] In some specific embodiments, referring to Figure 3 , when the current interval is in the first interval data group;

[0128] After the step of obtaining the outburst danger information of the zero net distance multi-coal seam group according to the outburst prevention treatment effect, the method further includes:

[0129] A100, whether the outburst danger information meets a preset index is judged;

[0130] In the embodiment, when implemented, the basis for judging whether the highlighted danger information meets the preset index can be determined according to the relevant content recorded in the Technical Code for Design and Construction of Highway Gas Tunnel - JTG / T 3374-2020.

[0131] A200, when the highlighted danger information meets the preset index, excavate from the second working face to the third working face; the distance between the third working face and the coal seam close to the coal seam in the zero-clearance multi-coal seam group is a third target distance;

[0132] In the embodiment, the third target distance is 5 m, that is, the minimum distance between the third working face and the coal seam close to the coal seam in the zero-clearance multi-coal seam group is 5 m.

[0133] A300, detect and obtain the current highlighted danger information corresponding to the third working face;

[0134] In the embodiment, when the minimum distance to the coal seam is 5 m, the current highlighted danger information corresponding to the third working face is obtained at least once. It should be particularly and explicitly pointed out that the information data corresponding to the current highlighted danger information in the embodiment is the same as the highlighted danger information obtained at 10 m.

[0135] A400, judge whether the current highlighted danger information meets the preset index;

[0136] In the embodiment, the process of judgment is the same as the judgment process in step A100.

[0137] A500, when the current highlighted danger information does not meet the preset index, carry out outburst prevention and control based on the third working face to each coal seam and obtain the corresponding outburst prevention and control effect to obtain the current highlighted danger information, and return to execute the step of judging whether the current highlighted danger information meets the preset index until the current highlighted danger information meets the preset index;

[0138] In the embodiment, the treatment method can directly use the existing related technology, which will not be described in the embodiment.

[0139] A600, after the current highlighted danger information meets the preset index, excavate from the third working face to the fourth working face; wherein the distance between the fourth working face and the coal seam close to the coal seam in the zero-clearance multi-coal seam group is a fourth target distance;

[0140] In the embodiment, the fourth target distance is 2 m, that is, the minimum distance between the fourth working face and the coal seam close to the coal seam in the zero-clearance multi-coal seam group is 2 m.

[0141] A700, taking the fourth working face as the third working face, and returning to perform the step of detecting and obtaining the current outburst danger information corresponding to the third working face until the current outburst danger information meets the preset index;

[0142] In the embodiment, the detection process is the same as that of the step A100 or the step A400, and thus details are not repeated here.

[0143] A800, after the current outburst danger information meets the preset index, taking each coal seam group as a zero-clearance multi-coal seam group, and excavating from the fourth working face to pass through the zero-clearance multi-coal seam group.

[0144] In some specific embodiments, referring to Figure 4 , before the step of determining the drainage hole arrangement scheme of the zero-clearance multi-coal seam group according to the outburst danger information, the method further includes:

[0145] B100, obtaining simulation calculation data information under different working conditions according to the first geological data;

[0146] In the embodiment, when obtaining the simulation calculation data information under different working conditions according to the first geological data, the specific working condition type needs to be determined first, then simulation calculation is performed according to the specific working condition type, and finally the corresponding simulation calculation data information is obtained.

[0147] It needs to be particularly and explicitly pointed out that in the specific implementation, the acquisition process of the example simulation calculation data information is as follows: first, the longitudinal section of the gas tunnel is acquired according to the first geological data information, the longitudinal section of the tunnel is taken as the observation surface, when the horizontal angle between the first working face and the longitudinal section of the tunnel is any included angle between greater than 0° and less than 90°, the first profile surface is acquired, after the first profile surface is acquired, a plurality of drainage holes that are spaced apart from each other are arranged on the first profile surface towards the geological body and the zero-clearance multi-coal seam group. In the example technology, when the drainage holes are arranged on the first profile surface, the spacing between any two adjacent drainage holes can be 2m, 3m or 4m, and in the specific implementation, the spacing between any two adjacent drainage holes is preferably 4m. After the arrangement of the drainage holes on the first profile surface is completed, the tunnel plane is taken as the observation surface, and then when the horizontal angle between the plane and the first working face or the first profile surface is any included angle between greater than 0° and less than 90°, the second profile surface is obtained, after the second profile surface is acquired, a plurality of drainage holes that are spaced apart from each other are arranged on the second profile surface towards the geological body and the zero-clearance multi-coal seam group, for supplementing the area not covered by the drainage holes on the first profile surface. In the example technology, when the drainage holes are arranged on the second profile surface, there also needs to be a spacing between the newly arranged drainage holes on the second profile surface and the drainage holes arranged on the first profile surface, that is, the drainage holes arranged on the second profile surface are used to supplement the area not covered by the drainage holes arranged on the first profile surface.

[0148] Of course, in the example technology, the simulation calculation data under different working conditions can also be acquired by establishing a model, and finally the drainage hole arrangement scheme to be supplemented or the entire drainage hole arrangement scheme is acquired according to the model.

[0149] According to the outburst danger information, the step of determining the drainage hole arrangement scheme of the zero-clearance multi-coal seam group includes:

[0150] B200, according to the outburst danger information and the simulation calculation data information, a first initial design scheme of the drainage hole of the zero-clearance multi-coal seam group is acquired; wherein the first initial design scheme includes a first initial arrangement area of the drainage hole;

[0151] In the embodiment, when obtaining the first initial design scheme, the data results of the gas leakage amount of the zero-clearance multi-coal seam group and the like which can reflect the outburst danger of the zero-clearance multi-coal seam group can be obtained according to the first simulation data information and the outburst danger information, and then the first initial design scheme is set according to the obtained data results, with the interval between any two adjacent drainage holes being 4 m at the first working face. It needs to be particularly and explicitly pointed out that the first initial design scheme needs to include the to-be-supplemented borehole area which is not covered by the drainage hole arrangement area. In the exemplary technology, a plurality of drainage holes with an interval of 4 m are arranged in the drainage hole arrangement area.

[0152] B300, verifying and screening a to-be-supplemented borehole area from the first initial arrangement area; wherein the to-be-supplemented borehole area is an area not covered by the drainage hole in the first initial arrangement area;

[0153] In the embodiment, in the process of verifying the first initial arrangement area and screening the to-be-supplemented borehole area, modeling software in the BIM technology can be used for modeling. When modeling, a model of a geological body and a geological model of the zero-clearance multi-coal seam group formed in the geological body need to be established first, and then a model of a tunnel needs to be established in the geological model after the establishment of the corresponding geological model. The model of the tunnel needs to pass through the geological model according to the excavation direction of the tunnel. Finally, a model of gas overflow and gas concentration and the like is established by using the established model, and the final drainage hole arrangement result is determined according to the simulation result.

[0154] It needs to be particularly and explicitly pointed out that in the exemplary technology, the geological model of the geological body and the geological model of the zero-clearance multi-coal seam group need to be modeled by using the first geological data obtained in the foregoing exemplary embodiment. Meanwhile, the model of the tunnel established in the geological model also needs to be implemented by using existing materials for specifying the tunnel direction and determining the tunnel construction method according to the construction drawings and design blueprints. Meanwhile, in the embodiment, the modeling software in the BIM technology includes but is not limited to CAD three-dimensional, REVIT, inventor, civil 3d of the Autodesk platform, catia, solidworks of the Dassault platform, or modeling software such as Generative Components, BentleyAECOsim of the Bentley platform. It needs to be emphasized that in the exemplary embodiment, the modeling method is a prior art, and the present application only applies it and does not involve the improvement or design of the specific modeling method and modeling steps, so this place will not be described in detail.

[0155] B400, supplementally arranging the number of boreholes in the to-be-supplemented borehole area to form a drainage hole arrangement scheme.

[0156] In the embodiment, the technology by way of example enables the application to determine the hole arrangement mode of the drainage hole according to the specific trend of the geological body and the zero-clearance multi-coal seam group formed in the geological body during specific implementation, and meanwhile, when the first working face or the surface of the zero-clearance multi-coal seam group exists in multiple directions, the application can also be arranged towards the zero-clearance multi-coal seam group on each first working face parallel to the working face, effectively solving the technical defect that the gas drainage is not complete in the zero-clearance multi-coal seam group due to the incomplete arrangement of the drainage hole only on one working face.

[0157] In some specific embodiments, referring to Figure 5 , according to the first geological data, the step of obtaining simulation calculation data information under different working conditions includes:

[0158] B110, according to the first geological data, obtaining longitudinal section information of the zero-clearance multi-coal seam group; wherein the longitudinal section information includes the contour information of the gas tunnel and the treatment contour information;

[0159] In order to determine the treatment range, first of all, according to the longitudinal section, the face formed by extending 12m along the seam towards the vault and the inverted arch bottom, the 12m face of all the seams shall be ensured to have a vertical distance greater than 5m from the vault and the inverted arch bottom, and the tunnel is 6.5m away from the vault and 6.5m away from the inverted arch bottom when extending 12m along the seam, and the tunnel is formed at the vault and the inverted arch bottom of the tunnel transverse section. Secondly, the section constructed by the curve of the vault and the horizontal line of the inverted arch bottom is the treatment range of the gas outburst, which is formed by extending 12m left and right of the tunnel on the transverse section.

[0160] In the embodiment, during specific implementation, the process of obtaining the longitudinal section information of the zero-clearance multi-coal seam group according to the first geological data includes: first, obtaining the longitudinal section graph of the region where the zero-clearance multi-coal seam group is located according to the first geological data, then drawing the contour surface of the gas tunnel in the longitudinal section graph, and extending 6.5m towards the vault and the inverted arch of the gas tunnel based on the contour surface of the gas tunnel to form the actual gas treatment contour line, and after the setting of the gas treatment contour line is completed, the longitudinal section graph forms the longitudinal section information. By way of example, the application can effectively treat the zero-clearance multi-coal seam group in the gas treatment contour line during specific implementation, and can ensure that the gas tunnel after treatment has high safety during construction.

[0161] B120, according to the longitudinal section information, obtaining the corresponding transverse section information of each seam in the zero-clearance multi-coal seam group; wherein the transverse section information includes the contour information and the treatment contour information;

[0162] In the embodiment, after the corresponding management profile information is acquired, the cross section information of the gas tunnel is acquired again by the longitudinal section information acquired in step B110. The process of acquiring the cross section information of the gas tunnel is divided into: obtaining a cross section drawing according to the longitudinal section information, in the cross section drawing, the corresponding cross section profile line of the gas tunnel is drawn according to the existing materials such as construction drawings, after the cross section profile line of the gas tunnel is drawn, the cross section profile line is taken as the highest point, the lowest point and the widest point on the left and right sides as the basis, the gas management profile line setting on the cross section drawing is performed, when the setting is performed, the cross section profile line is taken as the highest point and the lowest point as the reference point, 5m is extended to the directly above and directly below of the gas tunnel respectively, and the widest point on the left and right sides of the cross section profile line is taken as the basis, 12m is extended to the two sides respectively. It is emphasized that when 6.5m is extended to the directly above of the gas tunnel, the focus point of the vertical center line and the horizontal center line of the gas tunnel is taken as the reference point, the fan-shaped area is formed by deviating 45° to the left and right sides of the gas tunnel respectively, and then the profile line of the gas tunnel in the vault area covered by the fan-shaped area needs to be extended to the directly above of the geological body in the direction perpendicular to the tangent line corresponding to the point by 6.5m, that is, the gas management profile line in the 90° area range is parallel to the management profile line of the tunnel vault. For example, please refer to Figure 13 In the cross section drawing, the management profile line of the gas tunnel is a straight line structure on both sides and the bottom end, the top end is the gas management profile line in the 90° area range which is an arc line, the two ends of the arc line are straight lines, and the straight lines and the arc line are connected head to tail to form Figure 13 the polygon structure shown. In this way, the longitudinal section drawing and the cross section drawing including the longitudinal section information and the cross section information can be accurately acquired when the embodiment is implemented. And by way of example, the safety of the present application when gas is pumped and drained in the zero net distance multi-coal seam group is also ensured.

[0163] B130, a first model is established; wherein the first model is a data model for dynamically simulating the zero net distance multi-coal seam group, and the data model records coal matrix elastic modulus data, Poisson's ratio data, coal matrix density data, coal seam initial porosity data, coal seam fracture initial permeability data, gas dynamic viscosity data, initial gas pressure data, Langmuir pressure parameter data and Langmuir volume strain constant data;

[0164] In the implementation, the corresponding first model can be acquired according to the longitudinal section information and the cross section information, and then the coal matrix elastic modulus data, Poisson's ratio data, coal matrix density data, coal seam initial porosity data, coal seam fracture initial permeability data, gas dynamic viscosity data, initial gas pressure data, Langmuir pressure parameter data and Langmuir volume strain constant data and other data information can be acquired by using the existing technology.

[0165] It needs to be particularly and explicitly pointed out that in the embodiment, the model schematic of the example first model refers to Figure 18 , and the process of obtaining the first model is: for the actual situation of the example tunnel, COMSOL numerical simulation software is used, and C6 coal seam is selected for research. The engineering conditions are as follows: the original gas pressure of the coal seam is 2.5 MPa, the extraction negative pressure is 25 kPa, the model length is 10 m, the model width is 10 m, the borehole final hole spacing is 2 m (the conventional borehole spacing), the borehole diameter is 76 mm, and the vertical downward uniform load is 5 MPa. The model basic parameter values are shown in Table 1.

[0166] Table 1 Model parameter values

[0167] Parameter Value Elastic modulus E / Pa 2.8×109 Coal matrix elastic modulus E S / Pa 8.4×109 Poisson's ratio υ 0.3 Coal matrix density p s (kg m-3) 1.35×103 coal seam initial porosity φ0 0.037 Coal seam fracture initial permeability k0 / m2 8.6×10-17 Gas power viscosity μ g (Pa s) 1.08×10-5 Initial gas pressure P0 / MPa 2.5 Langmuir pressure parameter P L / Pa]]> 3.03×106 Langmuir volume strain constant V L ]] 0.026

[0168] Coal seam deformation feature analysis: in order to study the deformation of the coal seam with time along with the gas drilling, the borehole spacing of the calculation model is selected as 2 m, and the drilling time is selected as 5 d, 10 d, 30 d and 60 d. When the borehole spacing is certain, the closer to the borehole, the greater the volume strain is at the same time, and the farther to the borehole, the smaller the volume strain is. The longer the drainage time is, the greater the volume strain of the coal seam near the borehole is, but in the initial stage of the drilling drainage, the volume strain changes sharply, and with the increase of the drainage time, the volume strain changes slowly and tends to be stable.

[0169] Gas pressure evolution analysis: in order to study the evolution law of the coal seam gas pressure during the drilling drainage, the borehole spacing of the calculation model is selected as 2 m, and the drilling time is selected as 5 d, 10 d, 30 d and 60 d. When the borehole spacing is certain, the closer to the borehole, the smaller the residual gas pressure is at the same time, and the farther to the borehole, the greater the gas pressure is. The longer the drainage time is, the smaller the gas pressure of the coal seam near the borehole is, but in the initial stage of the drilling drainage, the gas pressure changes sharply, and with the increase of the drainage time, the gas pressure changes unobviously.

[0170] Coal seam permeability analysis: in order to study the change law of the coal seam permeability during the drilling drainage, the borehole spacing of the calculation model is selected as 2 m, and the drilling time is selected as 5 d, 10 d, 30 d and 60 d.

[0171] B140, according to the first model, the longitudinal section information and the transverse section information, the simulation calculation data information under different working conditions is obtained.

[0172] In the embodiment, in the specific implementation, the second model of the zero-net-distance multi-coal seam group including the first initial layout area can be established according to the transverse section information and the longitudinal section information; then the second model is checked, and the to-be-drilled area is selected from the second model. Finally, the simulation data information of the to-be-supplemented drilling area is formed.

[0173] In some embodiments, referring to Figure 6 , the step of checking and screening out the drilling area to be supplemented from the first initial layout area includes:

[0174] B310, establishing a second model of the zero-clearance multi-coal seam group including the first initial layout area according to the cross-sectional information and the longitudinal sectional information; wherein the second model is a three-dimensional model of each coal seam, and the three-dimensional model includes the strike information of each coal seam and the angle information between the gas tunnel and each coal seam;

[0175] In this embodiment, the second model can be obtained by using the software for establishing a three-dimensional model in the prior art during implementation.

[0176] It should be particularly and explicitly pointed out that, during implementation, the exemplary modeling software includes but is not limited to CAD three-dimensional, REVIT, inventor, civil 3d of the Autodesk platform, catia, solidworks of the Dassault platform, or the modeling software such as Generative Components and Bentley AECOsim of the Bentley platform. It should be emphasized that, in the exemplary embodiments, the modeling method is the prior art, and the present application only applies it, and does not involve the improvement or design of the specific modeling method and the modeling step, so this will not be described here.

[0177] B320, checking the second model and screening out the drilling area to be drilled from the second model.

[0178] In this embodiment, when checking the second model, the initial drainage hole can be established in the second model first, and then the geological area not covered by the drainage hole model is checked according to the established drainage hole model after the establishment is completed.

[0179] It should be particularly and explicitly pointed out that, in this embodiment, when the initial drainage hole model is established in the second model, the distance between any two adjacent drainage holes is preferably 4m, and each drainage hole should gradually pass through the zero-clearance multi-coal seam group and intersect with the gas control contour line according to the corresponding angle from the specific position of the first working face of the drainage hole.

[0180] In some embodiments, the step of drilling the drainage hole in the zero-clearance multi-coal seam group according to the drainage hole arrangement scheme includes:

[0181] According to the drainage hole arrangement scheme, drilling a hole in the first working face towards the zero-clearance multi-coal seam group to drill the drainage hole.

[0182] In some embodiments, referring to Figure 7, after the step of making the advanced geological prediction on the geological layer at the first working face to obtain the first geological data of the geological layer, further comprising:

[0183] C100, obtaining simulation calculation data under different working conditions according to the first geological data;

[0184] In the embodiment, in the implementation, first, the longitudinal section of the gas tunnel passing through the zero-clearance multi-coal seam group is obtained according to the first geological data, then the longitudinal section of the tunnel is taken as the observation surface, when the horizontal angle between the first working face and the longitudinal section of the tunnel is any included angle between greater than 0° and less than 90°, the first profile surface is obtained, after the first profile surface is obtained, a plurality of drainage holes spaced from each other are arranged on the first profile surface towards the geological body and the zero-clearance multi-coal seam group. In the exemplary technology, when the drainage holes are arranged on the first profile surface, the spacing between any two adjacent drainage holes can be 2m, 3m or 4m, in the implementation, the spacing between any two adjacent drainage holes is preferably 4m. After the arrangement of the drainage holes on the first profile surface is completed, the plane of the tunnel is taken as the observation surface, then when the horizontal angle between the plane and the first working face or the first profile surface is any included angle between greater than 0° and less than 90°, the second profile surface is obtained, after the second profile surface is obtained, a plurality of drainage holes spaced from each other are arranged on the second profile surface towards the geological body and the zero-clearance multi-coal seam group to supplement the area not covered by the drainage holes on the first profile surface. In the exemplary technology, when the drainage holes are arranged on the second profile surface, the spacing between the newly arranged drainage holes on the second profile surface and the drainage holes arranged on the first profile surface is also required, that is, the drainage holes arranged on the second profile surface are used to supplement the area not covered by the drainage holes arranged on the first profile surface.

[0185] It needs to be particularly and explicitly stated that in the embodiment, the longitudinal section and the transverse section correspond to the first profile surface data and the second profile surface data respectively in the exemplary simulation calculation data.

[0186] C200, determining the spacing distance between all the drainage holes according to the simulation calculation data to obtain the drainage hole arrangement scheme.

[0187] Of course, in the exemplary technology, the simulation calculation data under different working conditions can also be obtained by establishing a model, and finally obtaining the drainage hole arrangement scheme to be supplemented or obtaining the entire drainage hole arrangement scheme according to the model.

[0188] In the embodiment, the longitudinal section and the transverse section are established according to the first geological data, and the longitudinal section is taken as the observation plane, and the first profile is obtained when the horizontal angle between the first working face and the longitudinal section of the tunnel is any angle between greater than 0° and less than 90°, and then a plurality of extraction holes spaced from each other are arranged on the first profile towards the geological body and the zero-clearance multi-coal seam group. In the exemplary technology, when the extraction holes are arranged on the first profile, the spacing between any two adjacent extraction holes is 4 m. After the arrangement of the extraction holes on the first profile is completed, the plane of the tunnel is taken as the observation plane, and then the second profile is obtained when the horizontal angle between the plane and the first working face or the first profile is any angle between greater than 0° and less than 90°, and then a plurality of extraction holes spaced from each other are arranged on the second profile towards the geological body and the zero-clearance multi-coal seam group, so as to supplement the area not covered by the extraction holes on the first profile. In the exemplary technology, when the extraction holes are arranged on the second profile, the newly arranged extraction holes on the second profile also need to have spacing from the extraction holes arranged on the first profile. The arrangement scheme of the extraction holes can be quickly determined, and the arrangement efficiency of the extraction holes is improved.

[0189] In some specific embodiments, referring to Figure 8 According to the first geological data, the step of obtaining simulation calculation data under different working conditions comprises:

[0190] C110, according to the first geological data, obtaining longitudinal section information of the zero-clearance multi-coal seam group; wherein the longitudinal section information comprises the profile information of the gas tunnel and the treatment profile information;

[0191] In the embodiment, in the specific implementation, the process of obtaining the longitudinal section information of the zero-clearance multi-coal seam group according to the outburst danger information comprises: first, obtaining the longitudinal section graph of the region where the zero-clearance multi-coal seam group is located according to the outburst danger information, then drawing the profile of the gas tunnel in the longitudinal section graph, and extending 6.5 m towards the vault and the inverted arch of the gas tunnel respectively based on the profile of the gas tunnel to form the actual gas treatment profile line, and after the setting of the gas treatment profile line is completed, the longitudinal section graph forms the longitudinal section information. By way of example, the zero-clearance multi-coal seam group in the gas treatment profile line can be effectively treated in the specific implementation of the present application, and the gas tunnel after treatment has high safety during construction.

[0192] C120, according to the longitudinal section graph, obtaining the transverse section information corresponding to each coal seam in the zero-clearance multi-coal seam group; wherein the transverse section information comprises;

[0193] In the embodiment, after the corresponding management profile information is acquired, the cross-section information of the gas tunnel is acquired again by the longitudinal section information obtained in step C110. The process of acquiring the cross-section information of the gas tunnel is divided into: obtaining a cross-section drawing according to the longitudinal section information, in the cross-section drawing, the corresponding cross-section profile line of the gas tunnel is drawn according to the existing materials such as construction drawings, after the cross-section profile line of the gas tunnel is drawn, the cross-section profile line is taken as the highest point, the lowest point and the widest point on the left and right sides as the basis, the gas management profile line on the cross-section drawing is set, when setting specifically, the cross-section profile line is taken as the highest point and the lowest point as the reference point, 6.5m is extended to the upper and lower of the gas tunnel respectively, and the widest point on the left and right sides of the cross-section profile line is taken as the basis, 12m is extended to the left and right sides respectively. It needs to be emphasized that when 6.5m is extended to the upper of the gas tunnel, the focus point of the vertical center line and the horizontal center line of the gas tunnel is taken as the reference point, the fan-shaped area is formed by deviating 45° to the left and right sides of the gas tunnel respectively, and then the profile line of the gas tunnel in the vault area covered by the fan-shaped area needs to be extended to the geological body above the gas tunnel in the direction perpendicular to the tangent line corresponding to the point by 6.5m, that is, the gas management profile line in the 90° area range is parallel to the management profile line of the tunnel vault. For example, please refer to Figure 13 In the cross-section drawing, the management profile line of the gas tunnel is a straight line structure on both sides and the bottom end, the top end is the gas management profile line in the 90° area range which is an arc line, the ends of the arc line are straight lines, and the straight lines and the arc line are connected head to tail to form Figure 13 the polygon structure shown. In this way, the longitudinal section drawing and the cross-section drawing including the longitudinal section information and the cross-section information can be accurately obtained when the present application is implemented. And by way of example, the safety of the present application when gas is pumped and drained in the zero-net-distance multi-coal seam group is also ensured.

[0194] C130, a first model is established; wherein the first model is a data model for dynamically simulating the zero-net-distance multi-coal seam group, and the data model records coal matrix elastic modulus data, Poisson's ratio data, coal matrix density data, coal seam initial porosity data, coal seam initial fracture permeability data, gas dynamic viscosity data, initial gas pressure data, Langmuir pressure parameter data and Langmuir volume strain constant data;

[0195] In the implementation, the corresponding first model can be obtained according to the longitudinal section information and the cross-section information, and then the coal matrix elastic modulus data, Poisson's ratio data, coal matrix density data, coal seam initial porosity data, coal seam initial fracture permeability data, gas dynamic viscosity data, initial gas pressure data, Langmuir pressure parameter data and Langmuir volume strain constant data and other data information can be obtained by using the existing technology.

[0196] C140, obtaining simulation calculation data under different working conditions according to the first model, the longitudinal section information and the transverse section information.

[0197] It needs to be particularly and explicitly stated that the simulation calculation data exemplified in the embodiment includes first profile data and second profile data, the obtaining process of the first profile is that when the horizontal angle between the first working face and the longitudinal section of the tunnel is any angle between greater than 0° and less than 90°, the first profile is obtained by taking the longitudinal section as the observation surface; the obtaining process of the second profile is that when the horizontal angle between the plane and the first working face or the first profile is any angle between greater than 0° and less than 90°, the second profile is obtained by taking the plane of the tunnel as the observation surface.

[0198] In some specific embodiments, referring to Figure 8 , after the step of obtaining simulation calculation data under different working conditions according to the first model, the longitudinal section and the transverse section, the method further comprises:

[0199] C150, obtaining an initial design scheme of the drainage hole of the zero net distance multi-coal seam group according to the simulation calculation data; wherein the initial design scheme includes an initial layout area of the drainage hole;

[0200] In the embodiment, when specifically implemented, the first drainage hole is arranged on the first profile obtained in step C140 according to the interval of 4m between any two adjacent drainage holes, and the initial layout scheme is formed after the first drainage hole on the first profile is arranged.

[0201] C160, checking and screening a to-be-drilled hole area from the initial layout area; wherein the to-be-drilled hole area is an area in the initial layout area which is not covered by the drainage hole;

[0202] After the initial drainage hole is arranged, the tunnel plane is turned to, and it is checked whether there is an area which is not covered by the first drainage hole on the first working face, and when there is an area which is not covered, the area is defined as a to-be-supplemented drilling area.

[0203] C170, supplementally arranging a number of drilling holes in the to-be-drilled hole area to form a drainage hole layout scheme.

[0204] In the embodiment, when the to-be-supplemented drilling area is supplemented with drilling holes, the interval of 4m between any two adjacent drainage holes is also used for supplementally setting.

[0205] In some specific embodiments, referring to Figure 9 , the step of checking and screening a to-be-drilled hole area from the initial layout area comprises:

[0206] C161. Based on the cross-sectional and longitudinal information, establish a second model of the zero-net-distance multi-coal seam group, including the initial layout area; wherein, the second model is a three-dimensional model of each coal seam, and the three-dimensional model includes the orientation information of each coal seam and the angle information between the gas tunnel and each coal seam.

[0207] In this embodiment, the second model can be obtained by using existing software for creating three-dimensional models.

[0208] It should be specifically and explicitly stated that, in specific implementations, the modeling software used in the examples includes, but is not limited to, Autodesk CAD 3D, Revit, Inventor, Civil 3D, etc., Dassault Systèmes CATIA, SolidWorks, etc., or Bentley Generative Components, Bentley AECOsim, etc. It should be emphasized that, in the exemplary embodiments, the modeling methods are existing technologies, and this invention only applies them without involving improvements or designs to specific modeling methods or steps; therefore, they will not be elaborated upon here.

[0209] C162. Verify the second model and select the area to be drilled from the second model.

[0210] In this embodiment, when checking the second model, the initial drainage hole can be established in the second model first. After the establishment is completed, the geological areas not covered by the drainage hole model can be checked according to the established drainage hole model.

[0211] It should be specifically and clearly stated that, in this embodiment, when establishing the initial drainage hole model in the second model, the spacing between any two adjacent drainage holes is preferably 4m, and each drainage hole should gradually pass through the zero-net-distance multi-coal seam group at a corresponding angle from the specific position on the first working face of the drainage hole and intersect with the gas control outline.

[0212] In some specific embodiments, please refer to Figure 10 Gas overflow channels are formed in the zero-net-distance multi-coal seam group;

[0213] Following the step of installing drainage holes at the first working face towards the zero-clearance multi-coal seam group according to the drainage hole group layout plan, the following is also included:

[0214] S600 At the first working face, hydraulic perforation and hydraulic cutting are performed on the zero-clearance multi-coal seam group to increase the gas overflow channel.

[0215] In the embodiment, after the extraction hole is completed on the first working face, the hydraulic flushing and the hydraulic cutting are performed on the zero-clearance multi-coal seam group at the first working face to increase the gas overflow of the tunnel. In this way, the gas extraction efficiency of the zero-clearance multi-coal seam group can be improved, the gas extraction time of the gas tunnel can be reduced, and the safety of the gas extraction can be improved.

[0216] In some embodiments, referring to Figures 11 to 21 wherein, Figure 12 α is the angle between the outburst coal seam and the tunnel treatment contour line, C5, C6, C7-1, C7-2, C8-1, and C8-2 are coal seam numbers. The example technology of the application can include two implementation manners.

[0217] In an embodiment, the tunnel is excavated to a first working face, then the geological layer is pre-forecasted at the first working face to obtain first geological data of the geological layer, next the outburst danger information of the zero-clearance multi-coal seam group is obtained according to the first geological data, then the simulation calculation data information under different working conditions is obtained according to the first geological data, and the first initial design scheme of the extraction hole of the zero-clearance multi-coal seam group is obtained according to the simulation calculation data information and the outburst danger information, the to-be-supplemented drilling area is selected from the first initial layout area, then the number of drilling holes is supplemented in the to-be-supplemented drilling area to form an extraction hole layout scheme, finally the extraction hole is constructed in the zero-clearance multi-coal seam group according to the extraction hole layout scheme, and after the construction of the extraction hole is completed, the hydraulic flushing and the hydraulic cutting are performed on the zero-clearance multi-coal seam group at the first working face to increase the gas overflow channel. That is, in an embodiment, after the outburst danger information is obtained, the first initial design scheme of the extraction hole is first formulated, then the area without supplementary drilling holes in the first initial design scheme is selected and the area without supplementary drilling holes is supplemented with drilling holes to eliminate the omitted area in the first initial design scheme. In this way, the extraction hole layout result of the gas tunnel can be accurately obtained, and the technical defect that the gas extraction effect is poor when the gas tunnel is extracted due to the omission of the extraction hole setting in the related art can be effectively eliminated.

[0218] In another embodiment, the tunnel is excavated to a first working face, then at the first working face, the geological stratum is subjected to advanced geological prediction to obtain first geological data of the geological stratum, then according to the first geological data, simulation calculation data under different working conditions is obtained, according to the simulation calculation data, the interval distance between all the drainage holes is determined, and a drainage hole arrangement scheme is obtained, finally, after the drainage hole is completed, hydraulic flushing and hydraulic slotting are performed at the first working face to increase the gas overflow channel. That is, in another embodiment, the step of obtaining the outburst danger information of the zero-net-distance multi-coal seam group according to the first geological data, and determining the drainage hole arrangement scheme of the zero-net-distance multi-coal seam group according to the outburst danger information is replaced by the step of obtaining simulation calculation data under different working conditions according to the first geological data, and determining the interval distance between all the drainage holes according to the simulation calculation data to obtain a drainage hole arrangement scheme. In this way, the drainage hole arrangement result of the gas tunnel can also be accurately obtained, and the technical defect of poor gas drainage effect caused by the omission of the drainage hole setting of the gas tunnel in the related art is effectively eliminated.

[0219] Of course, in some embodiments, the gas tunnel can also be set up in the following example: the invention mainly solves the problem that when a multi-layer coal seam group constitutes an outburst coal seam group, the coal seam group and each layer of coal in the coal seam group are fully considered in designing the drainage hole arrangement, and the influence of the coal seam trend and the coal seam dip angle on the design of the drainage hole arrangement is also fully considered, the hole arrangement covers and has no blind area to prevent local places without drainage holes from causing local outburst risk and forming substandard treatment. The invention provides a reference for the treatment of outburst coal seam groups under various complex conditions. According to the tunnel design drawing, it is preliminarily judged whether the outburst coal seam group is composed of multi-layer coal seams, and within 20m from the coal seam normal line at the tunnel working face, geological drilling is used to determine the position, thickness, dip angle and intersection angle with the line of the coal seam, the thickness of the effective rock pillar between the coal seams, and according to the geology, a suitable construction method is selected (for example, the bench method), within 10m from the coal seam normal line, the outburst of each layer of coal is predicted by core drilling, and according to the outburst danger prediction of the coal seam and the effective thickness of the rock pillar between the coal seams, it is determined whether the coal seam is treated as an independent coal seam or the adjacent outburst coal seam group is treated as a gas drainage hole.

[0220] The following is described in more detail: according to the design drawing, the advanced drilling is 20 m away from the normal line of C6 coal seam, the proven coal seam position, thickness, dip angle and intersection of the line, the thickness of the effective rock pillar between the coal seams, and the coal seam is numbered. Preliminary judgment of coal seam classification: C5 is the first layer of coal, the distance between C6 and C7-1 is less than 10 m, which is less than the requirement of 7 m in the "Provisions for Prevention and Control of Coal and Gas Outburst 2019 Edition", C5 and C6 are adjacent coal seam management; C7-2, C8-1 and C8-1, the distance between the coal seams is less than 5 m, and they are managed together according to the net distance coal seam group. After completing the C5 and C6 coal seam drawing management, excavate to C6 m coal 10 m normal distance. The outburst danger of C7 and C8 coal seams is predicted, which has outburst danger. It needs to be managed by outburst measures, and C7 and C8 coal seam group is managed according to adjacent coal seam group, which is treated by gas drainage. The C7 and C8 coal seam group is organized to design the drainage borehole. According to the gas longitudinal section layout obtained by the advanced geological drilling, each layer is extended 12 m along the coal seam direction from the vault and the floor, and at least 5 m beyond the contour line, and the management contour line that meets the requirements is found out. Similarly, the corresponding contour line is found out in the tunnel plane layout according to the obtained data. According to the last layer C8-2 coal seam of C7 and C8 coal seam group, the drainage borehole enters the roof not less than 0.5 m. The coal seams and rock pillars in the rock pillar including C7 and C8-1 coal seams are all drained and managed. According to the characteristics of the coal seam, the COMSOL numerical simulation software is used, and for C8 coal seam, according to the gas pressure, ton coal gas content, the preliminary drainage negative pressure is 80 KPA, the model is established, and the drainage hole spacing is 2 m. 3 m, 4 m, 5 m. Different working conditions are simulated and calculated, and the optimal drilling hole spacing is determined to be 4 m. According to the final hole spacing of 4 m, the coal seam dip angle, the preliminary drainage borehole of all coal seams in the rectangular column formed by the coal seam group is arranged. According to the C7 coal seam borehole arrangement in the coal seam group, check and supplement part of the borehole. Because the coal seam trend and the line exist oblique intersection, in the left and right contour line and the coal seam dip angle calculation, it is found that there is a blind area, and different boreholes are supplemented according to different blind areas. According to the dip angle and trend, all the blind areas supplemented are calculated according to the coordinates to form a drilling data table. C8 coal seam is relatively thick, especially in the lower part of the tunnel body, the coal seam thickness is about 11 meters, and at the same time, considering that the coal seam is soft, the coal seam permeability is crossed, the hydraulic cutting and the hydraulic flushing are used to increase the coal seam permeability, increase the coal seam gas overflow channel, and speed up the drainage effect. The hydraulic flushing and the hydraulic cutting are designed separately. After the completion of the coal seam group borehole arrangement, experts discuss, consult the design unit and the coal mine design unit to discuss and demonstrate the soil and stone, form the formal coal seam drainage borehole special design drawing, and strictly construct according to the drawing.

[0221] In the example embodiment, the C7, C8 zero net distance multi-coal seam group of a certain gas tunnel is designed to be drilled through the layer Figure 14 、 Figure 15The technical scheme of the present application is that, after a gas tunnel is excavated and passes through a zero-clearance multi-coal seam group including multiple coal seams arranged in sequence along the excavation direction of the gas tunnel, a first working face with a distance from the coal seam closest to the zero-clearance multi-coal seam group being a first target distance is excavated along the tunnel excavation direction, at the first working face, the geological stratum is subjected to advanced geological prediction and first geological data of the geological stratum are obtained, then the outburst danger information of the zero-clearance multi-coal seam group is obtained according to the first geological data, and the drainage hole arrangement scheme of the zero-clearance multi-coal seam group is determined according to the outburst danger information, and finally the drainage holes are constructed in the zero-clearance multi-coal seam group according to the drainage hole arrangement scheme. The technical scheme of the example of the present application first performs advanced geological prediction on the geological stratum including the zero-clearance multi-coal seam group at the first working face with a distance from the coal seam being the first target distance before the drainage holes are constructed, and the outburst danger information of the zero-clearance multi-coal seam group is obtained according to the advanced geological prediction result, and preferably the drainage hole arrangement scheme of the zero-clearance multi-coal seam group is determined according to the outburst danger information, so that the present application can determine the corresponding drainage hole arrangement scheme according to the geological data corresponding to the zero-clearance multi-coal seam group when implemented, and the drainage holes are constructed on the first working face according to the determined drainage hole arrangement scheme, so that the person skilled in the art can perform the drainage hole construction when facing the zero-clearance multi-coal seam group, and the technical defect that the related art cannot directly use the related technology to arrange the drainage holes in the tunnel construction area to extract gas when the coal seam group is close to the zero-clearance multi-coal seam group is solved.

[0222] The above is only the optional embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields made according to the inventive concept of the present application and the content of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A method for arranging drainage holes in a gas tunnel with zero clearance between multiple coal seams, characterized in that, The gas tunnel is excavated and passes through the zero-clearance multi-coal seam group in the geological strata, the zero-clearance multi-coal seam group including multiple coal seams arranged sequentially along the excavation direction of the gas tunnel; The method for arranging the extraction holes includes the following steps: Excavate along the excavation direction to the first working face; wherein, the distance between the first working face and the coal seam located closest to it in the zero-net-distance multi-coal seam group is the first target distance; At the first working face, advanced geological prediction is performed on the geological strata to obtain the first geological data of the geological strata; wherein, the first geological data includes the geological data of the zero-net-distance multi-coal seam group; Based on the first geological data, excavation is carried out to the second working face, and outburst hazard information of the zero-net-distance multi-coal seam group is obtained based on the second working face; wherein, the distance between the second working face and the coal seam located close to it in the zero-net-distance multi-coal seam group is the second target distance, and the outburst hazard information includes gas pressure, gas content per ton of coal and coal seam firmness coefficient. Based on the aforementioned prominent hazard information, determine the layout scheme of the drainage holes for the zero-clearance multi-coal seam group; According to the drainage hole arrangement scheme, the drainage holes are constructed in the zero-clearance multi-coal seam group; The step of excavating to the second working face based on the first geological data and obtaining the outburst hazard information of the zero-clearance multi-coal seam group based on the second working face includes: Based on the first geological data, excavation proceeds to the second working face; Based on the second working face, obtain the current spacing between all adjacent coal seams; Based on the current spacing, formulate a corresponding handling plan; According to the treatment plan, outburst prevention and control measures are carried out on each of the coal seams, and the outburst prevention and control effects on each of the coal seams are obtained. Based on the outburst prevention and control effect, obtain the outburst hazard information of the zero-clearance multi-coal seam group; The disposal plan includes a first disposal plan and a second disposal plan; The step of formulating a corresponding treatment plan based on the current distance includes: The current spacing is divided into two groups: the current spacing less than 7m is divided into a first spacing data group, and the current spacing greater than or equal to 7m is divided into a second spacing data group. When the current spacing is in the first spacing data group, at least two coal seams corresponding to the current spacing are taken as the zero-net-distance multi-coal seam group, and the first treatment plan is executed. When the current spacing is in the second spacing data group, at least two coal seams corresponding to the current spacing are regarded as adjacent coal seam groups, and the second treatment plan is executed.

2. The method for arranging drainage holes in a gas tunnel with zero clearance and multiple coal seams as described in claim 1, characterized in that, The step of performing advanced geological prediction on the geological layer at the first working face and obtaining the first geological data of the geological layer includes: At the first working face, advanced drilling is performed on the geological layer to achieve advanced geological prediction and obtain the first geological data of the geological layer.

3. The method for arranging drainage holes in a gas tunnel with zero clearance and multiple coal seams as described in claim 1, characterized in that, When the current spacing is in the first spacing data group; After the step of obtaining the outburst hazard information of the zero-clearance multi-coal seam group based on the outburst prevention and control effect, the method further includes: Determine whether the highlighted hazard information meets preset indicators; When the prominent hazard information meets the preset index, excavation proceeds from the second working face to the third working face; the distance between the third working face and the coal seam located closest to it in the zero-net-distance multi-coal seam group is the third target distance; Detect and acquire the current protruding hazard information corresponding to the third working face; Determine whether the current prominent hazard information meets the preset indicators; When the current outburst hazard information does not meet the preset index, outburst prevention and control measures are carried out on each of the coal seams based on the third working face and the corresponding outburst prevention and control effect is obtained to obtain the current outburst hazard information. Then, the step of judging whether the current outburst hazard information meets the preset index is returned to be executed until the current outburst hazard information meets the preset index. After the current prominent hazard information meets the preset index, excavation proceeds from the third face to the fourth face; wherein, the distance between the fourth face and the coal seam located closest to it in the zero-net-distance multi-coal seam group is the fourth target distance; The fourth working face is taken as the third working face, and the process returns to the step of detecting and obtaining the current protrusion hazard information corresponding to the third working face, until the current protrusion hazard information meets the preset index; After the current prominent hazard information meets the preset index, each coal seam group is designated as the zero-clearance multi-coal seam group, and excavation is carried out from the fourth working face to pass through the zero-clearance multi-coal seam group.

4. The method for arranging drainage holes in a gas tunnel with zero clearance between multiple coal seams as described in any one of claims 1 to 3, characterized in that, Before the step of determining the drainage hole layout scheme of the zero-clearance multi-coal seam group based on the prominent hazard information, the method further includes: Based on the first geological data, obtain simulation calculation data information under different working conditions; The step of determining the drainage hole layout scheme of the zero-clearance multi-coal seam group based on the prominent hazard information includes: Based on the prominent hazard information and the simulation calculation data, a first initial design scheme for the drainage holes of the zero-net-distance multi-coal seam group is obtained; wherein, the first initial design scheme includes the first initial layout area of ​​the drainage holes; Verify and select areas to be drilled from the first initial layout area; wherein, the areas to be drilled are the areas not covered by the extraction holes in the first initial layout area; Additional boreholes are drilled in the area to be drilled to form the extraction borehole layout scheme.

5. The method for arranging drainage holes in a gas tunnel with zero clearance and multiple coal seams as described in claim 4, characterized in that, The step of obtaining the simulation calculation data information under different working conditions based on the first geological data includes: Based on the first geological data, the longitudinal profile information of the zero-clearance multi-coal seam group is obtained; wherein, the longitudinal profile information includes the outline information of the gas tunnel and the treatment outline information; Based on the longitudinal profile information, obtain the cross-sectional information corresponding to each coal seam in the zero-net-distance multi-coal seam group; wherein, the cross-sectional information includes the contour information and the treatment contour information; A first model is established; wherein, the first model is a data model for dynamically simulating the zero-net-distance multi-coal seam group, and the data model records the coal matrix elastic modulus data, Poisson's ratio data, coal matrix density data, initial porosity data of coal seam, initial permeability data of coal seam fractures, gas dynamic viscosity data, initial gas pressure data, Langmuir pressure parameter data, and Langmuir volumetric strain constant data. Based on the first model, the longitudinal section information, and the cross section information, the simulation calculation data information under different working conditions is obtained.

6. The method for arranging drainage holes in a gas tunnel with zero clearance and multiple coal seams as described in claim 5, characterized in that, The step of verifying and selecting areas to be drilled from the first initial deployment area includes: Based on the cross-sectional information and the longitudinal section information, a second model of the zero-net-distance multi-coal seam group including the first initial layout area is established; wherein, the second model is a three-dimensional model of each coal seam, and the three-dimensional model includes the orientation information of each coal seam and the angle information between the gas tunnel and each coal seam; Verify the second model and select the area to be drilled from the second model.

7. The method for arranging drainage holes in a gas tunnel with zero clearance between multiple coal seams as described in any one of claims 1 to 3, characterized in that, Gas overflow channels are formed in the zero-net-distance multi-coal seam group; After the step of performing drainage holes at the first working face facing the zero-clearance multi-coal seam group according to the drainage hole group arrangement scheme, the method further includes: At the first working face, hydraulic perforation and hydraulic slit cutting are performed on the zero-clearance multi-coal seam group to increase the gas overflow channel.

8. The method for arranging drainage holes in a gas tunnel with zero clearance between multiple coal seams as described in any one of claims 1 to 3, characterized in that, The step of constructing the drainage holes within the zero-clearance multi-coal seam group according to the drainage hole arrangement scheme includes: According to the drainage hole arrangement scheme, the drainage holes are drilled in the first working face facing the zero-clearance multi-coal seam group.

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